I am sure that you overestimate the effect of cocaine and underestimate your hard work as the real reason to your success.
Cocaine, like amphetamines, is a stimulant. And some people need stimulants to be able to perform. ADHD, which is something which can affect grownups as well as children, is alleviated with other stimulants than cocaine.
The problem with cocaine is that it is expensive, and that the effect is shortlived, and that you feel even worse afterwards. People with ADHD are given slow-acting amphetamines as medicines. You might discuss this with a psychiatrist, preferably one who is an expert on ADHD.